Abstract
1. 1. The penetration of DDT into and through the integument of Periplaneta americana (L.) is not a simple first-order function, but may be an aggregate of first-order events. 2. 2. Partitioning of DDT from the epicuticular grease into lower phases is the rate-limiting step in penetration. 3. 3. About 8 per cent of the DDT injected into the haemolymph back-diffuses into the epicuticular lipids. 4. 4. About 3 per cent of the DDT applied to the integument is recoverable from the haemolymph.
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